November 26, 2014 Public Information Centre # 2 Coronation Park Drainage Improvements Town of Oakville Municipal Class Environmental Assessment
Study Area & Drainage System Legend Coronation Project Park Drainage Title & Date Improvements 2 2
Why are we here? Purpose / Background The Town is undertaking a study investigating possible drainage improvements for the Coronation Park Community The first Public Information Centre (PIC) was held June 4, 2014 to obtain input from the public on drainage issues within the study area. The purpose of this second PIC is to present the subsequent assessment and resulting preliminary preferred solutions and receive input from the public Problem Statement The study has identified and confirmed drainage issues (i.e. standing water within ditches, deteriorating driveway culverts, minor ditch erosion and inadequate flow capacity) and developed preferred solutions to address these issues (such as storm sewer capital projects) within the Coronation Park Community Municipal Class Environmental Assessment The study will be conducted as a Master Plan, as defined in the Municipal Engineers Association Municipal Class EA document (2011) (Class EA), which is an approved process under the Ontario Environmental Assessment Act. The study will address the first two phases of the Class EA process, specifically, schedule A and Schedule B projects Future municipal projects will use the Master Plan as guidance to satisfy the EA process Coronation Project Park Drainage Title & Date Improvements 3 3
Municipal Class EA Process Phase 1 Identify and Describe the Problem(s) Phase 2 Alternative Planning Solutions Phase 3 Alternative Design Concepts For the Preferred Solution Phase 4 Environmental Study Report Phase 5 Implementation Identify reasonable alternative planning solutions. Evaluate the long-list of alternative solutions Identify a short-list of preliminary alternatives to the problem(s). Agency and Stakeholder Consultation PIC 1 Agency and Stakeholder Consultation PIC 2 Identify alternative designs to implement the preferred solution. Inventory natural, social/cultural and economic environments. Identify the impact of the alternative designs after mitigation. Evaluate alternative designs. Identify a preferred design. Compile an Environmental Study Report (ESR). Place ESR on public record for review for 30 days. Notify the public and government agencies of completion of the ESR and of the Part II Order provision in the EA Act. Proceed to construction of the project. Monitor environmental provisions and commitments. Problem Statement Preferred Solution Preferred Design ESR We Are Here The Master Plan Process will include Phases 1 and 2 of the Municipal Class EA Process, and will include a 30 day review of the Master Plan Coronation Project Park Drainage Title & Date Improvements 4 4
Drainage System Assessment Legend 300 Study Area Boundary Watercourse Storm Sewer and Pipe Diameter (mm) Local Drainage Issue (RYCB) Manhole Location Storm Sewer Outfall Minor Erosion Noted Local Ditch Drainage Issue Reported Flooding During Heavy Rain Moderate Erosion Noted Damaged or Obstructed Culvert (Driveway) Damaged or Obstructed Culvert (Roadway) Flow Obstruction Standing Water in Ditch/Channel Modeled Capacity Deficiency (Storm Sewer) Modeled Capacity Deficiency (Overland Flow) Deficient Culvert Noted for Backyard Swale and Beneath Pathway Reported Rear Yard Ponding and Flow Blockages Reverse Sloped Outfall Channel Reported Frequent Flooding on Westminster Dr. Reported Channel Drainage Issues Standing Water and Erosion Board Fence Blocking Channel Lack of Road Side Ditch on South Side of Lakeshore Road Reported Local Road Drainage Issue Note Driveway culverts & standing water observations based on field reconnaissance and public input. Issues shown may not reflect all existing deficiencies. Reported Backyard Channel Flooding and Ditch Capacity Issues Blockage of Watercourses at Lake Ontario due to Material Washing on Shore Coronation Project Park Drainage Title & Date Improvements 5 5
Long-List of Alternatives The following alternatives have been considered as part of a long-list to address the deficiencies identified with both the minor (storm sewer & culvert) system and major (roadway drainage) system. (Those alternatives identified with an check mark have been carried forward for further consideration). The others have been screened due to infeasibility and/or impracticality. Carried Forward Long-List of Alternatives Minor Major 1. Do Nothing 2. Increase size of storm sewers and culverts 3. Oversized pipes to provide stormwater storage with flow controls (storm sewers) 4. On-site Stormwater Management (SWM) on private properties 5. Storage areas within available public spaces (off-line in overflow areas) 6. Retrofits to existing SWM facilities to provide additional flow control (modifications) 7.A Storm sewer - Flow diversions (local inter-catchment) 7.B Overland flow - Modify grading on private property to mitigate flooding 8.A Storm sewer - Roof leader/foundation drain disconnection 8.B Overland flow - Modify grading with in road right-of-way to mitigate flooding 9. Low Impact Development Best Management Practices (LID BMPs) 10. New drainage system outlets (new storm sewer systems) 11. Combinations Coronation Project Park Drainage Title & Date Improvements 6 6
Evaluation Criteria Evaluation Criteria Description Alternative 1 Do Nothing Alternative 2 Increase size Alternative 8B Grading (public) Alternative 9 LID/BMP Alternative 10 New Storm Sewer Systems Alternative 11 Combinations Functional Extent to which the alternative addresses the Drainage System Flow Capacity Deficiencies Environmental Impacts to Lake Ontario (shoreline, erosion, water quality) Ability to Improve Public Safety Social Impacts on Private Properties Impact on Public Lands Capital Costs Economical Operations and Maintenance Costs Ease of Construction and Accessibility Constructability Construction staging and timing Legend Most Preferred Least Preferred ** Alternative 1 has not been carried forward as it does not address the problem statement. Coronation Project Park Drainage Title & Date Improvements 7 7
Alternatives Assessment The following Alternative Concepts have been assessed: Alternative 1: Do Nothing Serves as a baseline condition to compare the technical performance of all other alternatives and is required by the Municipal Class EA process This alternative does not provide measures to reduce or mitigate the existing problems, conditions and risks City of Hamilton - Red Hill Valley Parkway near Barton Street (July 26, 2009) City of Hamilton - Rosedale Area (July 26, 2009) Coronation Project Park Drainage Title & Date Improvements 8 8
Alternatives Assessment Alternative 8B-9 Alternative 8B-7 Alternative 8B-1 Alternative 8B-1 Alternative 10-8 Alternative 2-1 Alternative 10-2 Alternative 2-2 Alternative 10-1 Alternative 8B-10 Alternative 8B-3 Alternative 8B-8 Alternative 8B-2 Alternative 8B-4 Alternative 2-4 Alternative 10-3 Alternative 8B-8 Alternative 2-3 Alternative 10-4 Alternative 10-5 Alternative 10-9 Alternative 10-10 Alternative 10-7 Alternative 8B-6 Alternative 10-6 Alternative 8B-5 Legend 300 Study Area Boundary Watercourse Storm Sewer and Pipe Diameter (mm) Proposed New Storm Sewer\Culvert Proposed Upgraded Storm Sewer/Culvert Proposed Roadway drainage Improvement Proposed Re-graded Open Channel Coronation Project Park Drainage Title & Date Improvements 9 9
Alternatives Assessment Alternative 2: Increase Size of deficient Storm Sewers/Culverts Most effective, although there are possible issues related to cost and existing utility conflicts, as well as required ground cover. In combination with other alternatives this alternative provides a viable solution to the problem statement Alternative 2-1 Legend Alternative 2-4 Study Area Boundary Watercourse Alternative 2-2 Alternative 2-3 300 Storm Sewer and Pipe Diameter (mm) Proposed Upgraded Storm Sewer/Culvert Alternatives Assessed Carried Forward 2.1 - Culvert beneath pathway (Tracina Dr. & Venetia Dr.) 2.2 - Storm sewer between Tracina Dr. and Venetia Dr. 2.3 - Culvert at Lakeshore/Westminster 2.4 - Culvert at WWTP Coronation Project Park Drainage Title & Date Improvements 10 10
Alternative 7A: Flow Diversions Alternatives Assessment Considered applicable for storm sewer system only Assumes nearby storm sewer system with sufficient additional capacity and physically possible given grades and utilities No available storm sewers for diversions Considered further as part of Alternatives 10 & 11 (new storm sewer and combinations) Alternative 8B: Modify grading on private property (7B) or public property (8B) to mitigate flooding Could include roadways as well as open culverts and ditches In combination with other alternatives this alternative provides a viable solution to the problem statement Coronation Project Park Drainage Title & Date Improvements 11 11
Alternatives Assessment Alternative 8B: Modify Grading on Public Property Alternative 8B-7 Alternative 8B-9 Alternative 8B-10 Alternative 8B-11 Alternatives Assessed Carried Forward Alternative 8B-1 8B-1 - Third Line sag point (between Seafare Dr and Salvator Blvd) Alternative 8B-3 Alternative 8B-8 8B-2 - Roadway drainage system deficiencies along Walby Drive 8B-3 - Divert major flows from Walby Dr. along Warland Rd. to Westminster Dr. Alternative 8B-2 8B-4 - Divert major flows from Walby Dr. along Trenton Rd. to Westminster Dr. 8B-5 - Western channel in Coronation Park 8B-6 - Eastern channel in Coronation Park Alternative 8B-8 Alternative 8B-4 Alternative 8B-5 Alternative 8B-6 Legend 300 Study Area Boundary Watercourse Storm Sewer and Pipe Diameter (mm) Proposed Roadway Drainage Improvements Proposed Re-graded Open Channel 8B-7 - Reverse sloped outfall channel in Sedgewick Forest 8B-8 - Roadway drainage system Improvements along Lakeshore Road 8B-9 - Roadway drainage system Improvements along Westminster Drive 8B-10 - Roadway drainage system Improvements along Woodhaven Park Drive 8B-11 Roadway drainage system improvements on Sandwell Dr. and Tweedsdale Cr) Coronation Project Park Drainage Title & Date Improvements 12 12
Alternatives Assessment Alternative 9: Low Impact Development Best Management Practices (LID BMPs) Preferred techniques; bioswales, biorentention areas and exfiltration pipes - which can be combined with roadworks (Alternative 11) Considered appropriate for drainage system performance under smaller storm events as well as water quality Constrained by site-specific limitations (such as available space, grading, utilities, soils, groundwater levels, etcetera) - requires field investigations to confirm suitability Can be applied within both public and private lands In combination with other alternatives this alternative provides a viable solution to the problem statement Coronation Project Park Drainage Title & Date Improvements 13 13
Alternatives Assessment Alternative 10: New Drainage System Outlets - (New Storm Sewers) Considered appropriate for drainage system performance under smaller storm events only, some benefit in addressing roadway drainage system issues Where grades and locations are suitable; the following should be considered further In combination with other alternatives this alternative provides a viable solution to the problem statement Alternatives Assessed Carried Forward Alternative 10-8 10-1 - New storm sewer adjacent to 2033 Lakeshore Road West 10-2 - New storm sewer through Oakville Christian School 10-3 - New storm sewer along Third Line Alternative 10-1 Alternative 10-2 Alternative 10-3 Alternative 10-6 Alternative 10-7 Alternative 10-9 10-4 - New storm sewer along Belvedere Drive to West Channel 10-5 - New storm sewer along Belvedere Drive to Lake Ontario 10-6 - New storm sewer to West Channel near Walby Drive 10-7 - New storm sewer to East Channel Alternative 10-4 Alternative 10-10 Legend 10-8 - New storm sewer along Westminster Drive to East Channel Alternative 10-5 Study Area Boundary Watercourse 10-9 - New storm sewer along Woodhaven Park Drive to East Channel 300 Storm Sewer and Pipe Diameter (mm) Proposed New Storm Sewer\Culvert 10-10 -New storm sewer along Woodhaven Park Drive to existing storm sewer Coronation Project Park Drainage Title & Date Improvements 14 14
Alternative 11: Combinations Alternatives Assessment Likely appropriate for both storm sewer and roadway drainage system issues where no single alternative is sufficient to fully address identified issues Applied in this study: Preferred solution includes combinations of storm sewer and roadway drainage system improvements This alternative provides a viable solution to the problem statement Coronation Project Park Drainage Title & Date Improvements 15 15
Preferred Solution Proposed Culvert Replacement for Pathway Maintain Rural Road Section Re-Grade Ditches and Replace Damaged Culverts in Parallel with Storm Sewer Construction. Implement LID/BMP Techniques where Feasible Re-Grade Reverse Sloped Channel to Provide Positive Drainage Berm Existing Channel to Redirect Flows to Potential Storm Sewer (Headwall Inlet) Potential 525mm Storm Sewer Redirect Third Line Drainage to Proposed Trunk Storm Sewer Proposed Trunk Storm Sewer Re-Direct Existing Storm Sewer Outfalls to Proposed Trunk Storm Sewer to Preserve Downstream Channel Capacity and Minimize Flooding Re-direct Existing 900mm Storm Sewer to Proposed Trunk Storm Sewer to Maintain 900mm as Overflow if Feasible Proposed Storm Sewer Within Ditch (300mm- 675mm Approx.). Catch Basins Located on Both Sides Upgrade Storm Sewer Outfall Re-Grade and Widen Channel to Safely Convey Re-directed Flows. Some Berming Likely Required Consider Additional Measures at Lake Ontario to Limit Debris Blockages Proposed Storm Sewer Within Ditch (300mm- 675mm Approx.). Catch Basins Located on Both Sides Disconnect Existing 600mm Storm Sewer on Private Property Upgrade Existing 600mm Storm Sewer and outlet to accommodate Flows from proposed Woodhaven Park Dr. Storm Sewer Legend 300 Study Area Boundary Watercourse Storm Sewer and Pipe Diameter (mm) Proposed New Storm Sewer\Culvert Proposed Upgraded Storm Sewer/Culvert Proposed Roadway drainage Improvement Proposed Re- graded Open Channel Coronation Project Park Drainage Title & Date Improvements 16 16
Summary of Preferred Solution Re-graded channel within Coronation Park to receive flows from Westminster Dr. and Lakeshore Rd. West storm sewers New storm sewers and ditch improvements on Westminster Dr. and outlet improvements New storm sewer and ditch improvements on Woodhaven Park Dr. and outlet improvements New trunk storm sewer along Lakeshore Rd West (Third Line Coronation Park) Overland flow system improvements along Lakeshore Rd. West in conjunction with new trunk storm sewer to convey overland flow from Third Line to Coronation Park and to further reduce flows within ditch system crossing Belvedere Dr. Culvert and storm sewer upgrades on Tracina Dr. and Venetia Dr. Drainage assessment of channel behind Oakville Christian School Re-graded channel in Sedgwick Forest Low impact development will be considering during detailed design Coronation Project Park Drainage Title & Date Improvements 17 17
Timing of Proposed Works The remaining capital projects identified as part of this EA will be considered for inclusion in future 10yr capital budget forecast Drainage improvements to Lakeshore Rd. West will be further assessed during Lakeshore Rd. West Class EA Coronation Project Park Drainage Title & Date Improvements 18 18
Next Steps Receive public comments by December 12, 2014 Review and consider public comments and confirm or refine preferred solution Prepare, document and file description of preferred solutions in a Master Plan document for a 30 day public review period Prepare Staff Report to Community Services Committee (CSC) for consideration and approval (early 2015) Recommendations from this study to be included for consideration in the Storm Sewer Master Plan Coronation Project Park Drainage Title & Date Improvements 19 19
How to Provide Your Comments Please complete a comment sheet By mail, phone, fax or e-mail Kasia Piskorz, P.Eng. Project Leader Town of Oakville 1225 Trafalgar Road Oakville, Ontario L6H 0H3 Phone: 905-845-6601 Ext. 3533 Fax: 905-338-4159 Email: kasia.piskorz@oakville.ca Steve Chipps, P.Eng. Project Manager AMEC Environment & Infrastructure 3215 North Service Road, Burlington, Ontario L7N 3G2 Telephone: 905-335-2353 Toll Free: 1-886-751-2353 Fax: 905-335-1414 Email: steve.chipps@amec.com Please submit comments no later than December, 12 2014 Thank you for your participation! Coronation Project Park Drainage Title & Date Improvements 20 20